Abstract
Cross sections, angular distributions and forward-backward asymmetries are presented, of two-fermion events produced in e+e- collisions at centre-of-mass energies from 189 to 209 GeV at LEP, measured with the ALEPH detector. Results for e+e-, μ+μ-, τ+τ-, qq̄, bb̄ and cc̄ production are in agreement with the standard model predictions. Constraints are set on scenarios of new physics such as four-fermion contact interactions, leptoquarks, Z′ bosons, TeV-scale quantum gravity and R-parity violating squarks and sneutrinos.
Highlights
In the years 1995–2000, the LEP collider delivered e+e− collisions at centre-of-mass energies from 130 to 209 GeV
In order to reduce the uncertainties related to interferences between ISR and FSR, the exclusive cross sections and asymmetries are not extrapolated to the full acceptance
It is possible to reduce the dependence of this measurement on the b efficiency estimated from the simulation by replacing the product εbσb with Ndbata/L, where Ndbata is the number of b events in the data and L is the integrated luminosity
Summary
In the years 1995–2000, the LEP collider delivered e+e− collisions at centre-of-mass energies from 130 to 209 GeV. Measurements o√f the e+e− → f fprocess with the ALEPH detector up to s = 183 GeV have been published in [1]. The results obtained at seven additional energy values are presented in this paper with analyses largely unchanged with respect to [1]. The seven centre-of-mass energies are listed, together with the corresponding luminosities. In the year 2000 the luminosity was delivered in a range of energies. 3 presents the event generators used for the simulation of the signal and backgrounds, and Sect.
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